/*
 *  Axolotl - Alternate persistence for Grails
 *  Copyright (C) 2008  Juanjo García Latre
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package com.googlecode.axolotl.metaclass;

import java.util.regex.Pattern;

import org.codehaus.groovy.grails.commons.GrailsApplication;
import org.codehaus.groovy.grails.commons.metaclass.AbstractDynamicMethodInvocation;
import org.springframework.util.Assert;

import com.googlecode.axolotl.Database;


public abstract class AbstractDynamicPersistentMethod extends AbstractDynamicMethodInvocation {

	private Database database;
	private ClassLoader classLoader = null;

	
	public AbstractDynamicPersistentMethod(Database database, GrailsApplication application, Pattern pattern) {
		super(pattern);
		this.database = database;
		this.classLoader = application.getClassLoader();
	}


	protected Database getDatabase() {
		Assert.notNull(database, "Database is required!");
		return database;
	}


	@Override
	public Object invoke(Object target, String methodName, Object[] arguments) {
		ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();    
		try {
			Thread.currentThread().setContextClassLoader(this.classLoader);
			return doInvokeInternal(target, arguments);			
		}   
		finally {
			Thread.currentThread().setContextClassLoader(originalClassLoader);      			
		}
	}
	

	protected abstract Object doInvokeInternal(Object target, Object[] arguments);
}
